CN201725649U - Integrated inductor - Google Patents

Abstract

The utility model discloses an integrated inductor, which comprises a magnetic core and coils; the magnetic core comprises a casing and core rods which form a parted structure; the casing adopts an integrated structure; a plurality of cavities for accommodating the coils and the core rods are arranged on the casing; the core rod adopt column structure and arranged in the cavities on the casing; and a hollow coil is sleeved on each core rod. The utility model effectively solves the problems of large volume and complex assembly technique of a separate inductor in the prior art and the problems of easy breakage of a magnet body and greater mutual induction between two inductors of an integrated inductor in the prior art. The utility model has the characteristics of small volume, simple assembly, firm structure, high efficiency, large saturation current, small temperature rise, wide market prospect and the like, has less influence to others when used independently, and can be extensively applied to various DC converting circuits.

Description

A conjoined inductor

technical field

The utility model relates to an inductor, in particular to an integrated one-piece inductor. the

Background technique

Most of the inductors in the prior art adopt magnetic cores with structures such as EI, EE, EP, and PQ. These magnetic cores have only one central column, and a coil is arranged on the central column to form an inductor. However, in many circuits such as filters, multiple inductors are often used, resulting in an increase in the overall volume of the device and a complicated assembly process. Today, as electronic equipment is becoming increasingly miniaturized and integrated, electronic components are also developing towards miniaturization and integration. Such bulky discrete inductors are increasingly unable to meet the needs of miniaturization and integration of electronic equipment. The publication date is August 5, 2009, and the Chinese patent document with the publication number CN101499364A discloses a magnetic core and its integrated inductor, including a magnet with an end face and side walls on both sides of the end face. At least two extended column cores are arranged on the end face, and a magnetic plate is reliable on the side wall and the end face of the column core, and a magnetic gap is directly maintained between the end face of the column core and the magnetic plate. Or two magnets and a magnetic plate arranged between them and reliable on the side wall and the end face of the column core. A first coil and a second coil are arranged on the column core of the magnetic core, the first coil and the second coil on each column core are respectively connected in series, and the two ends of each coil are respectively arranged on the pins. The above-mentioned magnetic core and its integrated inductance are provided with side walls on the periphery of multiple column cores. Therefore, in order to surround the column cores, the cross-sectional area of the side walls must be increased correspondingly with the increase or increase of the column cores, so that multiple The column cores can jointly use the side wall as a path of the magnetic circuit, and the original respective side walls of each column core are solved by using the common side wall, thus greatly reducing the volume. In this structure, multiple column cores are arranged side by side on the integrated magnet, and the multiple core columns share the same peripheral magnet, thereby achieving the purpose of reducing the total volume of the inductor. However, this structure is only suitable for making inductors with large capacity. For small inductors, especially small inductors with high current and small inductance, the cross-section of the mandrel on the magnet is small, and the processing and assembly of the magnetic core are very difficult. Breaks easily. In addition, since multiple core posts share the same peripheral magnet, the mutual inductance between the inductances on the magnets is relatively large, and the inductances on the magnets have a great influence on each other when they are used independently. the

Utility model content

The utility model provides a one-piece inductor with small volume and simple assembly for solving the problems of large volume and complex assembly process in the prior art discrete inductors. the

Another purpose of the utility model is to solve the problems of the integrated inductors in the prior art that the magnets are easily broken and the mutual inductance between the inductors is large, and provide a conjoined type with a firm structure and a small mutual influence when the inductors on the magnets are used independently. inductor. the

The specific technical scheme adopted by the utility model to achieve the above technical purpose is: a one-piece inductor, including a magnetic core and a coil, the magnetic core includes a shell and a mandrel, and the shell and the mandrel are separated structure, the housing is an integrated rectangular parallelepiped structure, and the housing is provided with several cavities for accommodating coils and mandrels, and the mandrels are columnar structures, which are arranged in the cavities on the housing, and the core The rod is sheathed with a hollow coil. A plurality of cavities for accommodating coils and mandrels are set on an integrated rectangular parallelepiped shell, so that multiple inductors can be set on the same shell, which not only facilitates the series-parallel connection between inductors, but also The inductors are concentrated on one shell, which makes full use of the effective volume of the shell and eliminates the gap between traditional discrete inductors, thus effectively saving the space of the equipment. Compared with ordinary inductors, it can ensure the same electrical characteristics. At the same time, the assembly area of the device is effectively reduced, and the volume of the electronic device is reduced. The cuboid structure here also includes a cube structure. In addition, due to the split structure of the magnetic core shell and mandrel, the structure of the magnetic core is simplified, which is beneficial to the processing of the magnetic core. At the same time, it also greatly simplifies the winding of the coil and the assembly of the inductor, reducing the The breakage rate reduces the production cost. the

Preferably, the openings of the cavity are arranged on the same surface of the cuboid. The opening of the concave cavity is arranged on the same surface of the cuboid so that the pins of the inductance coil are on the same surface of the one-piece inductor, which is beneficial to the assembly of the inductor on the printed board. the

Preferably, the core rod has a circular, oval, rectangular or polygonal cross section. The mandrel with circular or rectangular cross-section is the common structure of inductor magnetic core, especially circular, because of the advantages of relatively convenient coil winding, small DC resistance, and less magnetic flux leakage, it is the best choice for magnetic core mandrels . the

Preferably, the cavity is a cuboid structure, the number of the cavity is greater than or equal to two, and the sizes of the cavity are the same. The cuboid structure here also includes a cube structure. the

Preferably, the concave cavities are arranged in a straight line, the intervals between the concave cavities are equal, and the concave cavities are in a single-row or multi-row structure. The arrangement of the cavity can be selected according to the number of inductors and the series-parallel structure, so as to meet the selection principles of convenient assembly and small overall volume. the

Usually, one mandrel is set in the cavity, that is, one cavity corresponds to one inductor, and two or more inductors can also be set in one cavity. the

Preferably, a gap is provided between the end surface of the mandrel and the cavity wall of the cavity. There is a gap between the end face of the mandrel and the wall of the cavity, that is, the length of the mandrel is less than the distance between the two opposite walls of the cavity. We can use the gap between the mandrel and the wall of the cavity as the inductance In this way, the gap can not only facilitate the assembly of the mandrel, but also prevent the inductance from being saturated when the current is large. the

The fabrication method of one-piece inductor usually includes the following steps:

a. The inductor shell is made of soft magnetic ferrite material or soft magnetic metal powder material, and two or more concave cavities for accommodating coils and mandrels are arranged on the shell;

b. Use soft magnetic ferrite material or soft magnetic metal powder to make the mandrel with columnar structure;

c. Enamelled copper wire is used to wind the hollow coil by the bidirectional spiral winding method;

d. Place the mandrel in the hollow coil;

e. Place the air-core coil and the mandrel together in the cavity on the housing. There is a gap between the end surface of the mandrel and the wall of the cavity, and the lead-out wire of the hollow coil extends out of the housing.

The inductor shell and mandrel can be made of soft ferrite manganese zinc, nickel zinc or soft metal reduced iron powder, iron-silicon alloy magnetic powder, iron-silicon aluminum alloy magnetic powder, etc., preferably iron-silicon alloy magnetic powder, iron-silicon alloy magnetic powder has The characteristics of low loss can ensure low temperature rise while working under high current, thus improving the working efficiency of the whole device. In addition, the assembly air gap between the shell and the mandrel allows the inductor to carry a larger current without saturation. The hollow coil is wound by the bidirectional helical winding method, that is, the hollow coil is wound from the axial direction and the radial direction of the coil body at the same time, and then wound in opposite directions. This winding method can effectively reduce the DC Resistance. After the winding of the coil is completed, the lead wires at both ends of the coil protrude from the shell, and the paint is removed and tinned, so that the lead wires can be used as plug-in terminals and soldered to the circuit board. When necessary, the mandrel, core rod and hollow coil can be bonded with potting glue or the cavity can be directly potted with potting glue, which can integrate the shell, mandrel and hollow coil, greatly improving the structural strength of the inductance coil . the

The beneficial effect of the utility model is that it effectively solves the problems of large volume and complex assembly process in the prior art discrete inductors and the easy broken magnets and mutual inductance between the existing integrated inductors in the prior art. Bigger problem. The utility model has the advantages of small volume, simple assembly, firm structure and small mutual influence when the inductors are used independently, and can be widely used in various DC conversion circuits. It has the characteristics of small volume, high efficiency, large saturation current and small temperature rise, and has broad application market expectation. the

Description of drawings

Fig. 1 is a kind of structural representation of embodiment 1 of the utility model conjoined inductor;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is a kind of structural schematic diagram of the one-piece inductor mandrel of the utility model;

Fig. 4 is a kind of structural schematic diagram of embodiment 2 of the one-piece inductor of the present invention;

Fig. 5 is a kind of structural schematic diagram of embodiment 3 of the one-piece inductor of the present invention;

Fig. 6 is another structural schematic diagram of Embodiment 4 of the one-piece inductor of the present invention.

Detailed ways

The specific implementation of the technical solution of the utility model will be further described below through the examples and in conjunction with the accompanying drawings. the

Example 1

In the embodiment 1 shown in Figure 1 and Figure 2, a one-piece inductor includes a magnetic core and a coil. The magnetic core includes a shell 1 and a mandrel 2, and the shell and the mandrel are of a separate structure. , the housing is an integrated cube structure, and the housing is provided with two cavities 4 for accommodating coils and mandrels, and the mandrels are in a cylindrical structure (see Figure 3), and each cavity A mandrel is provided, and a hollow coil 3 is sheathed on each mandrel, and the lead wires at both ends of the hollow coil protrude from the casing to form terminal pins 5 .

Example 2

The shell of Example 2 is a cuboid structure, and four cavities with a cuboid structure are opened on the shell, and the four cavities are arranged in a straight line (see Figure 4). The sizes of the cavities are the same, and the distances between the cavities are equal. , the opening of the cavity is located on the same side of the cuboid, a mandrel is arranged in each cavity, and a gap is provided between the end surface of the mandrel and the wall of the cavity, and the rest are the same as in embodiment 1.

Example 3

The shell of Example 3 is provided with 6 cavities, the cavities are arranged in a double-row structure, and each row has 3 cavities (see Figure 5).

Example 4

The shell of Example 4 is provided with 4 cavities, and two mandrels are set in each cavity, and each mandrel is sheathed with a hollow coil (see FIG. 6 ), and the rest is the same as that of Example 2.

In addition to mandrel structures with circular and rectangular cross-sections, the cross-section of mandrels can also adopt elliptical or polygonal structures. the

Below is a specific embodiment of the manufacturing method of the one-piece inductor:

a. The inductor shell is made of soft magnetic metal alloy F50 iron-silicon material. The outer dimensions of the shell are 11.5mm×11.5mm×11.5mm, and there are two concave cavities for accommodating coils and mandrels; The cavity size is 8.5mm×3.5mm×9.5mm,

b. Two core rods of Φ4mm×3.4mm are made of soft magnetic metal alloy F50 iron-silicon material;

c. Use Φ1.5mm enamelled copper wire to wind two hollow coils with an inner diameter of 4.40mm and a number of turns of 2.75Ts by two-way spiral winding method, and the part of the lead wire is tinned after removing the paint;

d. Place the mandrel in the hollow coil;

e. Place the air-core coil and the mandrel together in the cavity on the shell. There is a gap between the end face of the mandrel and the wall of the cavity, and the lead-out wire of the hollow coil protrudes 5mm from the shell.

After the one-piece inductance is assembled, use potting glue to bond the mandrel, hollow coil and shell or pot the cavity, and bake in an oven at 120-140°C for 20-40 minutes. The sealed product is taken out, and the corresponding characteristics and manufacturing code are printed on the top of the product to obtain a complete one-piece inductor. the

One-piece inductors have the characteristics of small size, high efficiency, large saturation current, low temperature rise, and wide operating frequency. They can be widely used in various DC conversion circuits such as notebook computers, desktop computers, and servers. the

Claims (8)

1. integral inductor, comprise magnetic core and coil, it is characterized in that: described magnetic core comprises housing and plug, housing and plug are for dividing body structure, the rectangular structure that described housing is integrated, housing are provided with several cavitys that holds coil and plug, and described plug is column structure, be arranged in the cavity on the housing, be arranged with air core coil on the plug.

2. integral inductor according to claim 1 is characterized in that the opening of described cavity is arranged on the same one side of cuboid.

3. integral inductor according to claim 1 is characterized in that the cross section of described plug is circular, ellipse, rectangle or polygonized structure.

4. integral inductor according to claim 2 is characterized in that described cavity is a rectangular structure, and the quantity of cavity is more than or equal to two, cavity big or small identical.

5. integral inductor according to claim 2 is characterized in that described cavity is arranged in a linear, and the spacing distance between the cavity equates.

6. integral inductor according to claim 5 is characterized in that described cavity is single-row or the multiple row structure.

7. integral inductor according to claim 1 is characterized in that being provided with in the described cavity one or several plugs.

8. according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 described integral inductors, it is characterized in that being provided with the space between the chamber wall of the end face of described plug and cavity.

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